An OBD2 (On-Board Diagnostics II) scanner can provide information about the status and health of various vehicular systems.

As your car ages and accumulates mileage, its O2 sensor readings can drift too far from the ECU’s expected values. When this occurs, it triggers the check engine light and stores an OBD-II code.

OBD I engine management, dating back to 1980, used just one upstream O2 sensor, mounted in the exhaust manifold, as close as possible to the cylinder head's heat.

Diagnostics An oxygen sensor that’s going bad or has failed altogether won’t always throw a check engine light or trip a diagnostic trouble code. Sometimes if there’s an internal problem ...

In the January issue, we discussed the history of OBD. This time we are going to investigate some of the technology required to meet OBD II standards. To give an idea of the magnitude of ...

We drill holes in an exhaust header to demonstrate how even the tiniest exhaust leak can affect O2 sensor accuracy and yield unreliable tuning data.

As my car was very obviously running too rich, and the diagnostic codes indicated an oxygen sensor failure, a repair was in order. I priced up replacement sensors, and a new oxygen sensor could be ...

As ever, I am fighting a marginally winning battle against my 1991 Mazda MX-5, and this is the story of how I came to install a wideband oxygen sensor in my Japanese thoroughbred. It came about as … ...

An oxygen sensor is a fairly innocuous-looking device, about the size and shape of a small child's finger. The body of the device is made from a zirconia ceramic with a metal base that screws into ...

Pre- and post-catalyst Exhaust Gas Oxygen (EGO) sensors are traditionally used to monitor oxygen storage capacity for On Board Diagnostic (OBD) purposes. In this paper the same sensors are used ...